<template>
  <div>
            <!-- 面包屑导航区域 -->
     <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>      
     </el-breadcrumb>
     <!-- 卡片视图 -->
     <el-card>
         <!-- 警告区域 -->
          <el-alert
             title="注意：只允许为第三级分类设置相关参数！"
             type="warning"
             :closable="false"
             show-icon>
          </el-alert>
          <!-- 选择商品分类区域 -->
          <el-row class="cat_opt">
              <el-col>
                  <span>选择商品的分类:</span>
                  <!-- 选择商品分类的级联选择框 -->
                  <el-cascader
                 
                 v-model="selectedCateKeys"
                 :options="cateList"
                :props="cateProps"
                @change="handleChange"
                ></el-cascader>
              </el-col>
          </el-row>
          <!-- tab页签区域 -->
    <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
        <!-- 动态参数表格     -->
        <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
                <!-- 循环渲染tag标签 -->
                <template slot-scope="scope">
                    <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handelClose(i,scope.row)">{{item}}</el-tag>
               
                <!-- 输入的文本框 -->
                <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
 </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <!-- 作用域插槽 -->
                <template slot-scope="scope">
                    <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDailog(scope.row.attr_id)">修改</el-button>
                    <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParms(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
        </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
             <!-- 静态参数表格     -->
        <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
                    <!-- 循环渲染tag标签 -->
                <template slot-scope="scope">
                    <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handelClose(i,scope.row)">{{item}}</el-tag>
               
                <!-- 输入的文本框 -->
                <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
 </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <!-- 作用域插槽 -->
                <template slot-scope="scope">
                    <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDailog(scope.row.attr_id)">修改</el-button>
                    <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParms(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
        </el-table>
        </el-tab-pane>
   </el-tabs>
     </el-card>
     <!-- 添加参数对话框 -->
     <el-dialog
  :title="'添加'+titleText"
  :visible.sync="addDialogVisible"
  width="50%"
  @close="addDialogClosed">
  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" >
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>
   <!-- 修改参数的对话框 -->
      <el-dialog
  :title="'修改'+titleText"
  :visible.sync="editDialogVisible"
  width="50%"
  @close="editDialogClosed">
  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
    data(){
        return{
            cateList:[],
            //级联选择框的配置对象
            cateProps:{
                 expandTrigger: 'hover' ,
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            //级联选择款的双向数据绑定的数组
            selectedCateKeys:[],
            //被激活的页签名称
            activeName:'many',
            //动态属性的参数数据
            manyTableData:[],
            //静态属性的参数
            onlyTableData:[],
            //控制添加参数对话框的显示与隐藏
            addDialogVisible:false,
            //添加参数的表单数据对象
            addForm:{
                attr_name:''
            },
            //添加参数的表单验证对象
            addFormRules:{
                attr_name:[
                     {required: true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
            //控制修改参数对话框的显示与隐藏
            editDialogVisible:false,
            //修改参数对话框的表单数据对象
            editForm:{
                //  attr_name:''
            },
            //修改参数的表单验证对象
            editFormRules:{
                 attr_name:[
                     {required: true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
         
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
       async getCateList(){
          const {data:res}= await this.$http.get('categories')
          if(res.meta.status!==200){
              return this.$message.error('获取商品数据失败')
          }
          this.cateList=res.data
        //   console.log(this.cateList)
        },
        //当级联选择框选中向变化会触发
       handleChange(){
           this.getParamsData()
          
        },
        //tab页签点击事件的处理函数
        handleTabClick(){
            console.log(this.activeName)
            this.getParamsData()
        },
        //获取所有参数的列表数据
       async getParamsData(){
             // console,log(this.selectedCateKeys)
            if(this.selectedCateKeys.length!==3){
                this.selectedCateKeys=[]
                 this.manyTableData=[]
                this.onlyTableData=[]
                return
            }
            // console.log(this.selectedCateKeys )
            //选择了三级分类
            //根据所选分类的id 和当前所处的面板获取对应的参数

          const {data:res}= await this.$http.get(`categories/${this.cateId}/attributes`,{
              params:{sel:this.activeName}
              })
          if(res.meta.status!==200){
              return this.$message.error('获取参数失败')
          }
          console.log(res.data)
        //循环遍历从后台返回的数据对象，以空格分割attr_vals中的字符串
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []

                item.inputVisible=false,
                item.inputValue=''
            })
            

          if(this.activeName==='many'){
              this.manyTableData=res.data
          }else{
              this.onlyTableData=res.data
          }
        },
        //监听添加参数对话框的关闭
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮添加参数
      addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                // console.log(valid)  valid 的值为true或false  可以用来做预验证
                if(!valid) return
              const {data:res}= await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status!==201){
                    return this.$message.error('添加参数失败')
                }
                 this.$message.success('添加参数成功')
                 this.addDialogVisible=false
                 this.getParamsData()
            })
        },
        //点击修改按钮 弹出修改参数的对话框
       async showEditDailog(attr_id){
          const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                params:{attr_sel:this.activeName}
            })
            if(res.meta.status!==200){
                return this.$message.error('获取参数失败')
            }
            this.editForm=res.data
           this.editDialogVisible=true
        },
        //监听修改参数对话框的关闭事件
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        //点击按钮 修改参数
        editParams(){
            this.$refs.editFormRef.validate(async valid=>{
                if(!valid) return
                 const {data:res}= await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                attr_name:this.editForm.attr_name,
                attr_sel:this.activeName
            })
            if(res.meta.status!==200){
                return this.$message.error('修改参数失败')
            }
                this.$message.success('修改参数成功')
                this.getParamsData()
                this.editDialogVisible=false
            })
         
        },
        //删除参数
       async removeParms(removeId){
       const removeParmsResult= await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err=>err)
            if(removeParmsResult!=='confirm'){
                return this.$message.info('已经取消了删除')
            }
          const {data:res}= await this.$http.delete(`categories/${this.cateId}/attributes/${removeId}`)
          if(res.meta.status!==200){
              return this.$message.error('删除参数失败')
          }
              this.$message.success('删除参数成功')
             this.getParamsData()
        },
        //文本框失去焦点或按enter键  都会触发
        handleInputConfirm(row){
            // console.log(555)
            if(row.inputValue.trim().length===0){
                row.inputValue='',
                row.inputVisible=false
                return
            }
            //如果没有return 则证明输入的内容需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            row.inputVisible=false
            //调用函数  将数据保存到数据库中
            this.saveAttrvals(row)
        },
        showInput(row){
            row.inputVisible=true
            //让文本框自动获得焦点
           // $nextTick方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
             this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        })
        },
        //将 attr_vals 中的数据更新到数据库中
       async saveAttrvals(row){
             const {data:res}= await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })
            if(res.meta.status!==200){
                return this.$message.error('更新参数失败')
            }
                this.$message.success('更新参数成功')
        },
        //删除参数属性
        handelClose(i,row){
            row.attr_vals.splice(i,1)
            //调用更新参数的函数
            this.saveAttrvals(row)
        }
      
    },
    //计算属性
    computed:{
        //如果按钮需要被禁用，返回true，否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length !==3){
                return true
            }
            return false
        },
        //当前选中的三级分类的id
        cateId(){
            if(this.selectedCateKeys.length === 3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        titleText(){
            if(this.activeName==='many'){
                return '动态参数'
            }else{
                return '静态属性'
            }
        }
    },
    
}
</script>

<style lang="less" scoped>
    .cat_opt{
        margin: 15px 0;
    }
    .input-new-tag{
        width: 120px;
    }
    .el-tag {
    margin: 10px;
}
  
</style>